Images

Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).

Eruption of Soufriere Hills, Montserrat, November 2009

Map showing global ash and aviation encounters

Bariloche sand filters

Postshield eruption are the fourth stage of a Hawaiian volcano's evolution. A cap of evolved magma erupts to cover the surface of the volcano. Not all volcanoes have evidence for this phase.

Rejuvenated stage volcanism occurs after the volcano has moved away from the mantle hot spot. Eruptions occur in sporadic locations and may be interspersed with long periods of erosion.

Examples of seismograms of different types of earthquakes and tremor (constant ground shaking) recorded in Hawai‘i.

Michael Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory.

An American exchange participant views the former hospital in Amero where the entire first floor was buried by lahars from Nevado del Ruiz (the second floor is visible).

U.S. and Chilean scientists prepare for a research flight during the 2008 VDAP eruption response at Chaitén.

View of Mount Baker from the west. Summit area draped with aerial imagery from National Agriculture Imagery Program (NAIP) collected in September 2015. Digital topography from High-resolution digital elevation dataset for Mount Baker and vicinity, Washington, based on lidar surveys of 2015: U.S.

Table of ash fall severities based on accumulated thickness.

Collapsed roofs after severe ashfall from Galunggung Volcano, West Java, Indonesia.

CVO Open House

Block diagram showing subduction of the Juan de Fuca Plate beneath the North American Plate along the Cascadia Trench, which is the western edge of the Cascadia subduction zone. Oceanic crust forms by eruptions along the Juan de Fuca Ridge.

Mount Jefferson viewed from Highway 26, Oregon.

InSAR (Interferometric Synthetic Aperture Radar) is a technique for mapping subtle ground deformation using radar images from Earth-orbiting satellites. With its global coverage and all-weather imaging capability, InSAR has become an increasingly important technique for studying volcanoes in remote regions such as the Aleutian Islands.

May is Volcano Preparedness Month in Washington State.

During the cleanup after the 18 August 1992 eruption of Mt Spurr volcano, Alaska. The population of Anchorage used mostly wet methods to clean up the ash, creating a peak water demand which resulted in water shortages and loss of pressure in some parts of the city due to bottlenecks in the distribution system.

Early on the morning of May 18, 1980, the landslide swept into the upper North Fork Toutle River valley and came to rest within about 22 km of the volcano. The landslide deposit, however, was saturated with water, and contained snow and ice blocks from the volcano's former glaciers.

Join us July 25-29, 2016, for a 5-day educator workshop at Mount Rainier. The workshop features informative talks on Cascade volcanoes and volcanic processes, ideas for classroom activities, hikes into the field, and tips for organizing school field trips to visit the volcano. There is no charge for this workshop and camping is available to participants.